Instruction manual

The response received will consist of the following data fields :
SOM ➟ BIC-II I.D. ➟ PORT ➟ MSG ➟ EOM
The contents of the MSG field will be equal to the message transmitted from the product to the BIC-II less the
products ’start of message’ and ’end of message’ characters. Refer to the product instruction manual for
message types and structures.
FIFO BUFFER REQUEST
This message is for communicating with Milltronics products utilizing simplex convention . It is sent to retrieve
the most recently updated message from the RAM Table, via the BIC-II FIFO Buffer.
Data ASCII Example
Field Character Description
SOM STX start of message
BIC-II I.D. 01 BIC-II #1
COMMAND B5 to retrieve data via the FIFO buffer
EOM CR end fo message
The response received will correspond to the state of the FIFO buffer :
Point data : SOM ➟ BIC-II I.D. ➟ PORT ➟ MSG ➟ EOM
FIFO empty : SOM ➟ BIC-II I.D. ➟ COMMAND ➟ EOM
94\10\17
PROGRAM
TIP
PROGRAM
TIP
Retrieve data from the RAM table until data for all
points has been retrieved. FIFO Buffer Requests may
then be used to retrieve data for updated points only,
to reduce message traffic. If RamTable Requests are
used exclusively, a means should be established to
determine the freshness of the data retrieved.
FIFO Buffer Requests may be used to reduce message
traffic once data has been received from all points using
RAM Table Requests. Monitor the time between the
FIFO Buffer Response messages associated with each
product port to verify continued communication activity
between the product and the BIC-II. If the FIFO empty
response is not received regularly, Ram Table Requests
must be used exclusively.
PL-371 8 – 8